It's a lot stiffer. I have an ooollld IBM Model M A/T mechanical keyboard that I have had for a very long time and like very much (using adapters of course!). In fact, companies still make those keyboards retrofitted for USB.
I like the tactile feedback, the sound, the feel, etc. Feels like using an electric typewriter. However, ironically (as it's a complete opposite!), I find myself using my Apple wireless keyboard more and more. The chiclet keyboard Apple uses is really growing on me. I understand why people like it.
If there are any stores near you that sell electric typewriters and have them on display (most OfficeMax stores near me do, can't tell ya why, but they do). That's about what it feels like. Go type a couple paragraphs on one of those and see what you think. It's a ballpark anyway, each keyboard is different.
I don't know what keyboards you are looking at, but look around eBay for an IBM Model M. Yes, it's beige and ugly, yes it's big and heavy, yes it's 20+ years old and yes it has one of those old long coiled cords! But, they are invincible, and the typing experience on one of those is INCREDIBLE. There are adapters available to adapter whatever version (PS/2 or the old AT) you have down to USB.